Hi Marshall, The "low wave" you sometimes hear may be a "resultant tone". Here is a simple example. If you play two notes, one with frequence of 300 hertz and the other with a frequency of 400 hertz there will be a "resultant tone" (or "difference note") at 100 hertz (400-300 = 100) So far as I am aware no one has developed a method of tuning using resultant tones as a diagonostic tool. At 02:32 AM 1/8/2006 +0000, you wrote: > what is your take on that phenomina? Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. Non calor sed umor est qui nobis incommodat mailto:pianotuna@yahoo.com http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK, S4S 5G7 306-539-0716 or 1-888-29t-uner
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